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Two ratio electric drive unit

a technology of electric drive unit and ratio, which is applied in the direction of mechanical equipment, transportation and packaging, and packaging, etc., can solve the problems of low energy efficiency, environmental pollution, and a large amount of energy, and achieve the effect of low speed ratio and high drive torqu

Active Publication Date: 2020-01-14
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a vehicle electric drive unit that combines a one-way clutch and a selectable one-way clutch. This results in a high drive ratio, high-speed regeneration capability, and fast shift times while reducing the risk of overvoltage. The selectable one-way clutch allows the powertrain to operate in reverse and provide regeneration at a low speed ratio. Overall, this patent offers a solution to increase torque density while ensuring safe and efficient operation of the electric drive unit.

Problems solved by technology

Most automobiles in current use are driven by fuel engines which experience a great deal of mechanical loss and have low energy efficiency, thereby consuming a lot of energy and causing environmental pollution.
Vehicle packaging is continually pushing for increased torque density, which presents increased risk of overvoltage of the system during uncontrolled generation.

Method used

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Examples

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Embodiment Construction

[0031]Example embodiments will now be described more fully with reference to the accompanying drawings.

[0032]Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0033]The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,”“an,” and “the” ...

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Abstract

A powertrain includes an electric motor and a first planetary gear stage having a first rotatable member drivingly connected to the electric motor and at least one second rotatable member. A second planetary gear stage includes a third rotatable member drivingly connected to the at least one second rotatable member and includes at least one fourth rotatable member. One of the third rotatable member and the at least one fourth rotatable member is connected to an output member. A passive one-way clutch and a selectable one-way clutch are associated with at least one of the first and second planetary gear stages for varying operation of the first and second planetary gear stages based upon an operation state of the selectable one-way clutch and a direction of rotation of the electric motor.

Description

FIELD[0001]The present disclosure relates to a powertrain for an electrified vehicle and more particularly to a two-ratio electric drive unit.BACKGROUND AND SUMMARY[0002]This section provides background information related to the present disclosure which is not necessarily prior art.[0003]Most automobiles in current use are driven by fuel engines which experience a great deal of mechanical loss and have low energy efficiency, thereby consuming a lot of energy and causing environmental pollution. Electric vehicles operate using stored electric energy for powering an electric motor. As battery technology has improved, the popularity of hybrid electric and electric vehicles has increased over the last several years. However, the packaging requirements for traditional electric motor drive systems have influenced the vehicle designs and efficiency.[0004]Vehicle packaging is continually pushing for increased torque density, which presents increased risk of overvoltage of the system during...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H3/66F16H3/089F16H3/091F16H3/10F16H3/36
CPCF16H3/091F16H3/10F16H3/089F16H3/363F16H3/66F16H2200/201F16H2200/2007F16H2200/2084F16H2200/2097F16H2200/2005F16H2200/0021F16H2200/2035F16H2200/2023F16H2200/2069B60K17/046
Inventor LITTLEFIELD, JOSEPH R.ROSS, CRAIG S.
Owner GM GLOBAL TECH OPERATIONS LLC
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